增加：在缺词处加一个漏词符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

2）只允许修改10处，多者（从第11处起）不计分。

    Ladies and gentlemen,

    It's my honor to give a speech here. After-class activities play a important part in our school life. Proper activities help enrich our lives, broaden our horizons or develop our personalities.

    Mine own experience can serve as a case in point. When I was in Senior One, I become a member of our drama club, that I used to visit on weekends. Since my participation in various activities organizing by the club, I achieved a lot.

    These activities bring me a lot of funs, provide me with good opportunities to develop new friendships and open a window through which I have a brand-new outlook. With so much advantages shown above, why not to join us at once?

生活中的衣食住行与化学密切相关，结合所学知识和生活常识完成以下问题。
（1）民以食为天。下表为学校食堂的午餐菜谱，其中米饭能为学生提供的营养素为____，从均衡营养的角度，你建议再补充的一种食物是____ 。

 
（2）随着生活水平的提高，人们对衣着越来越讲究。下列制作衣服的原料属于天然有机高分子材料的是____。
①棉花     ②涤纶     ③蚕丝     ④锦纶     ⑤羊毛 
（3） 精明的商家开发了形式多样的竹炭饰品，在装点新居的同时达到净化空气的目的，这是因为竹炭具有较强的吸附性，具有这一性质的原因是其具有____ 的结构。
（4）自驾旅游选用乙醇汽油作燃料。写出乙醇燃烧的化学方程式____。